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Effect of vitamin D3 supplementation on serum calcium, 25-OHD, and 1,25-OHD in the short-term study, by treatment group. Individual values for serum calcium, 25-OHD, and 1,25-OHD at baseline and 8 wk for the 25 subjects are shown. Biochemical assays are reported in metric units. To convert from metric to SI units, multiply calcium by 0.25 (millimoles per liter); 25-OHD by 2.496 (nanomoles per liter); 1,25-OHD by 2.6 (picomoles per liter).
